Improve repr string representation of spatial types

[robsdedude]

Instead of POINT(1.0 2.0 3.0) (regardless of the sub-type) the repr string representation is now WGS84Point(1.0, 2.0, 3.0) or similar.

This is more in line with Python's recommendations:

If at all possible, this should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment). If this is not possible, a string of the form <...some useful description...> should be returned.

-- https://docs.python.org/3/reference/datamodel.html#object.__repr__

[MaxAake]

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